if [ -z "${pfx}" ]; then
desc_return="Return: @true if @v was updated, @false otherwise."
fi
cat <<EOF
/**
* ${class}${atomicname}() - atomic add unless value with ${desc_order} ordering
* @v: pointer to ${atomic}_t
* @a: ${int} value to add
* @u: ${int} value to compare with
*
* If (@v != @u), atomically updates @v to (@v + @a) with ${desc_order} ordering.
* Otherwise, @v is not modified and relaxed ordering is provided.
*
* ${desc_noinstr}
*
* ${desc_return}
*/
EOF